Question

When a force of 2N acts on a mass of 2 kg for a time of 2s. what is the rate of change of momentum a)2 b)8 c)4 d)16

Answer 1

Force = F = 2N

Mass = m = 2 kg

Time = t = 2s

As we know that Rate per change in Momentum is known as Force. However it is the Second Law of Sir Issac Newton.

F = 2

ma = 2

m(v-u)/t = 2

Consider, If initial Velocity of particle is zero.

mv/t = 2

2v/2 = 2

v = 2 m/s

P = √2km

P = √2.1/2mv².2

P = √2×2×2×2

P = 2 Kg m/s

Therefore, Change in Momentum = P = 2 Kgms-¹

K = Kinetic Energy of the particle.